Briquetting method



BRIQUETTING METHOD Filed April 8. 1925 MATERIAL RAv rR/ or- MATERIAL 2-00 iii: 354'" 1-75 menu: 1- G0 1- 50 durum Beams An'rmucrrl. 25

com. rm:-

CHARCOA IMLL Danna-Rs 0/ 0/01/65 WITNESS INVENTOR v ELLiWO/il'h 8. ll. Zworm 7 MWLW I Patented May 3, 1927.

UNITED STATES PATENT OFFICE ELLSWOBTH B. A. ZWOYER F PERTH AHBOY, NEW JERSEY, AS BIGNOB TO GEN nan. rum. nnroun'r'rr. conrorwrron, NEW yonx.

OF NEW YORK, N. 1., A'CORPOBA'IION OI nnreunr'rmq nnz'rnon.

Application filed April s,

This inven'tion relates to roller presses of the type employed for the agglomeration or briquettihg of loose materials capable of being compressed or compacted intobriquettes.

Briquetting presses as heretofore constructed are of 'two general types known as mechanical feed and gravit feed presses. The former is characterize by the provision of preliminary mechanically operated feeding devices which force the material to the bight of the briquetting rolls and while such" presses give fairly satisfactory results, they are subject to the objection that the pressure placed on the material cannot be re ulated. '1 The gravity feed type is characterize by the omission of preliminary mechanically operated feeding devices, the material being fed to the bight of the rolls from a vertically extendin column of, material placed in a suitable hopper located above the rolls and so arranged that the column is supported by the roll surfaces. With this arran'ement, the material is ressed or forced irectly into the bight of the rolls by the pressure due to the weight of the column, which pressure obviously can be varied by regulating the height of the-column.

The present invention relates more particularly to the gravity feed type of briqilietting presses, which although they have e advantage of enabling. the briquetting pressure to e varied between wide limits, exhibit the culiarity which I have discovered, that while rolls of a given size or diaml eter will give entirely satisfactory results for a certainmaterial, such rolls will not work satisfactorily for other materials and in some instances will even fail entirely to pro- 7 duce a compactin or coherence of such other materials. fter man experiments,

I have also discovered that the failure of av given press having rolls of a given or certain' diameter to compact certain' materials is caused by differences in the specific gravity 5 of the material treated. Further ex r1- ments have proven that if a certain de nite relationship be maintained between the roll diameters of the press rolls and the specific gravity of the material being treated, a suc- 0 cessful briquetting action can be obtained of any loose material .capable of being briquetted.

In order to overcome the objection due to the above noted peculiarity, one of the prin-' i cipal objects ofthisinvention is to provide proportioning the roll diameters are constructed and arranged to intermesh 1925. Serial-Ho. $1,478.

a briquetting press in which'the diameters of the press rolls bear a certain definite,'pr edetermined relation to the specific ravity of the material being treated. Anotfier object is to provide a method for determining or ofv a -briquetting press according to, or in a certain definite predetermined relationship with,the specific gravity of the material to be treated. In the accompanying drawings .formin a art hereof,-Fig. 1 is a side elevation'o a riquetting press of the type to which this' .invention relates and Fig. 2 is agraph or chart which indicates the nature of the rela-' 1 ti'onship. between the roll diameters and material. I

The press shown in Fig. 1 comprises a pair of cylindrical rolls a and b, having-the cir cumference thereof provided with a plural-' ity of similar, equall spaced recesses c, of equal dimensions. equal number of. these recesses are rovided on each roll and the ears d are xed upon shafts e upon whic the rolls are secured." The gears e with a gear train fto cause the recesses of one roll to register or align in coo crating relationship with the recesses of t e other roll to form pockets in which the briquettes are formed. Power from any suitable source may be supplied for rotating the press rolls. V

In the graph shown in Fig. 2, the ordinates represent different values of the specific gravit of the materialto be treated while the a scissa represent the sizes of the roll diameters. The relationship which I- have discovered must exist between the-spe-. cific avity andthe roll diameter, is repre" sente by the curve A, B, wh"ich curve 'col responds substantially to the equation where :2: equals the roll dlameter, y equa'ls the specific gravity, and k, Is,and aare constants. The value of V the constants depends upon the length (if the briquette along the roll circumference. Assuming a briquette-having a dimension or length. of two inches along the roll circum- .ference and by takin the ordinates for the specific gravity ten 'old,.,in order to avoid fractions, the v liles of such constants for the curve dra n to the scale shown are h=36.25, 0:26.25, and 0:21.25. An applicationof'the method for determining the required roll diameter for a g gravities'and roll diameters given by the "equation holds true for all values of the.

given material, is as follows: Assuming that the material to be treated is magnetic fiue dust having a specific gravity of 1.6, by taking the abscissa of the curve AB corresponding to the ordinate 16 or ten times 1.6, the value of such abscissa will be found to be 17, therefore a roll having a diameter of l?" should'be used.

The curve AB shown in Fig. 2 represents the proper values and relationships for briquettes 2 inches long along the circumference of the press rolls. If this dimension of the briquette is varied or departed from, it then becomes necessary to modify the roll diameter determined above. The required modification can be readily determined by reference to the equation Dz where cl equals 2 the diameter of the roll as determined from the graph or curve and Z equals the length of the new briquette.

The relationship between the specific specific ravities-between the limits (la-a} or 5 and is or 26.25 respectively, while for values below or above such limits the curve approaches a straight line which is parallel to the X axis for the case of the lower limits and parallel to the Y axis for the upper limits.

ll claim:

1. In the art of briquetting by the use of presses of the gravity feed type, the method which consists in first determining the spe cific gravity of the material to be briquetted, then computing the diameter of the rolls of the press to be employed for bri netting such material, by reference to a typified by a graph, the'characteristics of which are substantially expressed by the incorporatin equation (ac-h) (yk :11? where w equals the roll diameter, 3 the specific gravity of the material to be treated, and h, k, and a are constants whose values are respectively equal, for ordinates of ten times the specific gravity, to 36.25, 26.25, and 21.25 for briquettes having a length of two inches along the circumference of the roll, then in the press a roll having 11 thus determined diameter and subjecting material of the said specific gravity to the action of said'rolls.

2. Inthe art of briquetting by the use of presses of the gravity feed type, the method which consists in first determining the specific gravity of the material to be briquetted, then computing the diameter of the rolls of the A press to be employed for briquetting such material byreference to a formula tvpified by a graph, the characteristics of which are substantially expressed by the equation (nfih)?+,(y.-k) :a where w'equals the roll diameter, 3 the specific gravity of the material to be treated, and h, kyand a are ormula constants whose values are respectively equal for-ordinates of ten times the specific gravity to 36.25, 26.25, and 21.25 for briquettes having a length of two inches along the circumference of the roll, modifyingthe value for said rolldiameter obtained from said graph for briquettes of different dimensions by reference to the equation D where fl the press, to be employed for briquetting such material, by reference to a formula typified by a graph, the characteristics of which are substantially expressed by the equation.

where w equalsthe roll diameter, and the specific gravity of themater'ial to be treated,

then incorporating in the press a roll havinga thus determined diameter and subjecting materialof the said specific gravity to the action of said rolls.

a. In the art of briquetting by the'use of presses of the gravity feed type, the method which consists in first determining the specific gravity of the materialto bebriquetted, then computing the diameter of the roll of the press to be employed for briquetting such material, by reference to a formula typified by a graph whose characteristics are expressed by the equation o'- -=+ewhere as equals the roll diameter, y the specific gravity of the material to be treated,

specific gravity to'the'action of said rolls.

5. In the art of briquetting by the use of presses of the gravity iced type, the method and h, k, and a are constants, incorporating -1n the press a roll having :1. thus determined diameter and subjecting material of the said 5 which consists'in first determining the specific gravityof the material to be briquetted,

then computing the diameter of the rolls of a the press to be employed for bri netting such material by reference to a ormula. typified by a graph having a definite curvature and representing definite predetermined relationships. between various specific gravities and roll diameters, incorporating in the press a roll having a thus determined diam eter and subjecting material of the said specific gravity to the action of said rolls.

ELLSWORTH B. A. ZWOYEIB.v 

